Home / 274.14-411.27-81.78

Finding the Fourth Proportional to 274.14, 411.27 and 81.78

Calculator

Solution

The fourth proportional to 274.14, 411.27 and 81.78 is: 122.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.14 : 411.27 = 81.78 : x
  2. Step 2: Convert to fraction form
    274.14/411.27 = 81.78/x
  3. Step 3: Cross multiply
    274.14x = 411.27 × 81.78
  4. Step 4: Simplify right side
    274.14x = 33,633.66
  5. Step 5: Solve for x
    x = 33,633.66/274.14
  6. Step 6: Final answer
    x = 122.69

Related Problems

Find fourth proportional to 137.07, 205.64 and 40.89
Half scale
Find fourth proportional to 548.28, 822.54 and 163.56
Double scale
Find fourth proportional to 275.14, 412.77 and 82.78
Similar ratio
Find fourth proportional to 411.21, 616.91 and 122.67
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.